Balloon Robot was created as part of Triple Eight"s groundbreaking "Design or Die" open design challenge. We enlisted a community of creatives from around the world to design, collaborate and vote on designs. Of the more than 170 entries, Balloon Robot, designed by Llereni Medina of Chicago, IL, emerged as a favorite. So we decided to produce it and kick back a portion of the proceeds to this up and coming designer. Balloon Robot is available in Black and Light, both in our Rubberized finish with our Sweatsaver Liner. Brainsaver Rubber Helmet Sizing Chart: To ensure a perfect fit, measure the circumference of your head starting in the middle of your forehead and match it with the sizes below. XS 20.10 in – 20.50 in (51-52cm) S 20.60 in – 21.30 in (52-54cm) M 21.40 in – 22.00 in (54-56cm) L 22.10 in – 22.90 in (56-58cm) XL 23.00 in – 24.00 in (58-60cm)